Automatic switch for electric circuits.



No. 851,808. PATENTED APR. 30, 190'?v C. H. HILL. AUTOMATIC SWITCH FORELECTRIC CIRCUITS.

APPLICATION IILET) OCT. 22. 1904.

l i i l l /itmesses Inventor: f/Z/ Charles H. Hili.

zz MQLW" nnrrnn swans PATENT onnron- CHARLES H.5H1LL, or scnnnnrmnr,NEW-YORK, ASSIGNOR TO GENERAL ELECTRIOCQMPANY, A CORPORATION OF NEWYORK.

' Auroi-earlo swrroH Fos ELEQTBIO clsourrs.

ripecification of Letters Patent.

Patented April 30, 1907.

Application filed October 22,1904. Serial Ida 229562;

To all whom it may concern Be it known that I, CHARLES H. lliLL, a

i a citizen of the United States, residing at Schenectady, in the countyof Schenectady and 5*State t New York, have invented'certain new anduseful Improvements in Automatic Sw tches for Electric Circuits, orwhich the following is a specification.

for electric circuits, and is particularlyapplicable to the control ofmotor-generator sets charging storage batteries. 1 shall conse-*fticular application.

batteries, it is important that the battery (airquently' describe myinvention as thus applied, but it will be understood that my'inv'entionis not necessarily limited to this par- In charging storagecuit should. be opened when "the battery fully charged. 1 take advantageof the diminution ol"v current-flow, when the battery fully charged, toopen the battery circuit,

and I also provide means for opening the cir-.

. My invention will best be understood by reference to the accompanyingdrawings, in which i 1 F' ure 1 shows a front elevation of a swit alarranged inaccordance with my invention; Fig. 2 shows a side elevationof the same, with one of the controlling magnets in cross-section; andFig. 3 shows a diagram of connections as applied to the control of a moar sents a generator driven by the motor M and tor-generator set forcharging .a storage battery. Referring first to Fig. 3, M represents anelectric motor connected through the switches m m to a suitable sourceof current, as indicatedby the line-wires L. G repreconnected throu hthe switches g g to the storage batter.)

C Crepresent two .tri mg coils which-are connected res ectiv'e y mcircuit with the enerator G an in shunt to the motor M,- eit or directlyor in series res ectively as under-load-release and no-- with the shuntfield, as shown, and which act v0 tage-release magnets. .The cores 0 andcviy'invention relates to automatic switches battery circuitconsequently falls due tot-he increase 'in battery potential; the coil-C.will.

release its core, thereby opening switches m and g, bringing the motorto rest and discon-.

necting the generator from the battery. .Overcharging the battery isthus prevented. In case the supply of current to the motor M shouldfail, the coil C will release its core, thereby opening theswitches gand m, disconnecting the motor from the sourceand the generator from-thebattery, and preventing the battery from discharging. through thegenerator.

The construction of the.,switches is shown in Figs. 1 and 2. Each switchis pr 'ded with a handle H, as shown in Fi 2, an it is connected througha link h to the operating blade g. The handle and link It form a togglewhich looks the switcheblade in position. I is a spring which tends to 0en the switch whenever the toggle is mov past its dead center. Eachswitch-blade is provided with an auxiliary shunt contact J to break theare on opening the circuit. A represents a shaft rotatably mounted inthe to of the casings of the coils (land 0 This s aft has secured "to ita handle D, by means of which the shaft may be rocked. Loosely mountedon the shaft are the trippin bars T and T, which are provided wit slots, adapted to be enaged by Tpins a on the shaft A, as shown in ig. 2.e cores of the magnets are shown in their normal osition,,that israised, but it will be evident i 'iom Fig. 2 that if the core c isreleased, it will strike the trippingbar T, rocking it so as to engagethe handle H and move the toggle joint past its dead center, allowingthe spring I to open the switch, Also secured to the shaft A is a hookor dog E which, when the switch-blade g is open, is

adapted to'engage a notch in the pivoted lever F, which is normally heldpressed against a stop f on the switch-blade g by the spring will belifted, andthe hook or dog E on the erator G is then adjusted to its proer value,

the under-load release coil is then pushed u The tripping bars areprovidedwith handles nets arenot' ushed' up into position before.

. by Letters Patent of the United'States,-is,-

generator circuitnient with the tripping bars T and T. V

- sition to be engaged. [5

the magnets are in proper position. I do not desire to l'mit myself tothe particular construction and arrangement of set, twosetsof switcheseach adapted and set, two sets of switches each. adapted toopen thecircuit of both motor and generator, a trippingmagnetfor one setconnected f. There, is only-one dog on the shaft A,- and I gnly onepivoted lever F, as is evident from i 1g. 1. s The operation is asfollows: If all the switches are open, and'it isdesired to start up themotor-generator set to charge the battery, handle D is first pushedinward, rocking shaft A so as. to bring the pins a into 'enga e-.

rocking these tripping bars, the cores 0 and cshaft A will engage thenotch on the pivoted lever'F which, since switch 7 is open, is in po-This en agement between the dog- E and the lever holds shaft- A in theposition to which it. moved b the handle D, and locks the tripping bars"and T so that they cannot be returned by the magnet cores to engagethe-handles of the switches when the handle D --is released. The. twooutside switches m and m are then closed, and the motor-circuit iscompleted. The core 0'" ofthe nd-vOltwe-release coil C is then pushed upinto the position shown, where it is held'by the coil C. The voltage-ofgenand-the switch closed, therebv c osing one leg oft-he. generatorcircuit. -The core 0 of into-thelposition shown, and the switch g ispivoted lever F is moved out of engagement with the dog E and thetripping bars T and T are released, and are freeto ytrip the switcheswhen'the battery is charged, or-if the. source ofcurrent for the motorfails.

t t, by means of which the circuit of the motor and generator may besimultaneously opened bv hand at any time. g

It will be seen that if the cores of both magclosing switc g, theswitches will be im ediately tripped. It. is thus impossible to leavethe switches closed unlessthe cor'esof parts here shown, but aim inthela pended I claims to cover all modifications w ch are within thescope .of my invention- What I claim asnew and desire to secure 1. Incombination with'a motor-generator arranged 'to-open the circuits ofbothrnotor and generator, means for actuating one set on the failure ofvoltage in .the motor-circuit,

and means for operating the other set upon apredeterinined variation ofcurrent the 2. .I-ncombinatiori with a motor-generator tripping devicesfor .sa'ld shunt circuit to the motor-armature, and a trippingcoil forthe other set connected in series with the generator armature.

- 3. In combination with a motor-generator set, two sets of switcheseach adapted toopen the circuit of both mot-or and generator, a

nc-voltage-release magnet controlling one set and connected in themotor-circuit. and an under-load-releasemagnet controlling the otherset.

4. In combination with a motor-generator set, two pairs of switches,each being arranged to open one leg of the circuits of both machines,and independent tripping devices for'said pairs.

5'. In combination with a motor-generator set, four independentlyoperable switches controlling the circuits of said machines, two .ineach circuit,two independent tripping de viceseachcont-roll-ing onegenerator and. one .motor switch, and means for rendering saidtrippingdevices inoperative until the generatorswitches are closed.

6. In combination Wltha motorgenerator set, fo ur independentlyoperableswitches 9 c controlling the circuits of said machines, two in eachcircuit, two independent tripping devices each controlling one generatorand one mot-or...switch,; means for restraining said tripping devices inan inoperative position at starting, and means for releasing saiddevices upon the closing of a generator switch.

' 7. In combination with a motor-generator controlling thecircuitsof'said machines,- twoin each circuit, two independent tripping de viceseachcontrolling one generatoran one motor-switch, a latch forrestraining said tripping devices in an inoperative position,

and operative connections. between said latch and one of the generatorswitches.

8. In combination, two pairs of independently-operable switches, ashaft, twoindependent trippingdvicesfor said pairs loosel mountedonsaidshaft, means on said sha for engaging said devices when said shaftis set, four independently. operable switches.

rocked, a dog .on said shaft, a latch ada ted tobe. engaged thereby whensaid sha is -rocked, andoperative connections between said latch and oneof said switches.

9. In combination, two' pairs of independently operable switches, twoindependent pairs, means for moving-said devices 1 to an inoperativeosition, a latch for said moving means, an operative connections-betweensaid latch and oneofsaidswitcheswhereby said devices are released whensaid switch is closed. i

10.. In'combina'tion with a'mot'orge'neratorset, ano-lvoltagefelease-magnet in the motor-circuit, anunder-load'-release;,magnet in the generatorcircuit', andindependentmeanscontrolled' byzsaid magnets for opening both'circuits; fw I 11 In combination, twomagnets, a shaft extending above said magnets,two members loosely mounted on said shaftadapted to be engagedrespectively by the cores of said magnets, and fourindependently-operable switches adept-ed to be tripped two by one ofsaid members and twoby the other.

12. In combination, two niagnets, a shaft egrtndihg' above said magnets,two members loosely journaled on said shaft and adapted to be engagedrespecti 'ely by the cores of said magnets, independently-operableswitches adapted to be tripped by said mem-

